Portable power system



FIG. 1 is a perspective front view of a portable power system;

FIG. 2 is a front elevation view of the portable power system;

FIG. 3 is a rear elevation view of the portable power system;

FIG. 4 is a left side elevation view of the portable power system;

FIG. 5 is a right side elevation view of the portable power system;

FIG. 6 is a top plan view of the portable power system; and,

FIG. 7 is a bottom plan view of the portable power system. 

CLAIM The ornamental design for a portable power system, as shown and described. 